California was one of the first states to abolish affirmative action, after voters approved Proposition 209 in 1996. Across the University of California system, Latinos fell to 12 percent of newly enrolled state residents in the mid-1990s from more than 15 percent, and blacks declined to 3 percent from 4 percent. At the most competitive campuses, at Berkeley and Los Angeles, the decline was much steeper.

Eventually, the numbers rebounded. Until last fall, 25 percent of new students were Latino, reflecting the booming Hispanic population, and 4 percent were black. A similar pattern of decline and recovery followed at other state universities that eliminated race as a factor in admissions.